Another bean object in Command bean of SimpleFormController

[joshi.sujit]

Hi All,

I have "CustomerGeneral" bean and i am using this as command bean in my SimpleFormController. This bean has some plain properties like firstName, lastName etc...
I am using these properties in my JSP form as spring binding like this:
<spring:bind path="customerGeneral.firstName"></spring:bind>
<spring:bind path="customerGeneral.lastName"></spring:bind>

Actually all these information like firstName, lastName are in another bean named "Contact".

Now i want to create an object of "Contact" in my command bean "CustomerGeneral" and create getter and setter methods for that. And use the firstName and lastName properties from this new bean into my JSP form page.

I have created object property for this new bean with getter and setter methods. I am using these firstName and lastName properties in my JSP form page like this:
<spring:bind path="customerGeneral.contacts.firstName"></spring:bind>
<spring:bind path="customerGeneral.contacts.lastName"></spring:bind>

but while page is loading it is throwing this error:

ERROR [org.springframework.web.servlet.tags.BindTag] - MESSAGE : Invalid property 'contacts' of bean class [com.izmocars.crm.customer
.dto.CustomerGeneral]: Value of nested property 'contacts' is null -
org.springframework.beans.NullValueInNestedPathExc eption: Invalid property 'contacts' of bean class [com.izmocars.crm.customer.dto.CustomerGeneral]: Value of
nested property 'contacts' is null


What could be wrong?
Please help me!!!

[iririr]

Can you post the code of the GeneralContract and cotract. Also the appropriate code from your controller.

[TerpInMD]

You need to initialize the object in the command:

Contact contacts = new Contacts();

[joshi.sujit]

Thanks Terp,

I did it like what you said... and it is working for Contact object.

But now i have got new problem... I have a set of address object in my contact bean. How to access address bean properties. I am getting error while accessing them.

Here is my code...

CustomerGeneral.java
=======================
public class CustomerGeneral
{
private IfwCompanies ifwCompany = new IfwCompanies();
private IfwCompanies ifwDealer = new IfwCompanies();
private IfwContacts ifwContacts = new IfwContacts();

/*
Setters and getters...
*/

}


Contact.java
=================
public class Contacts
{
private String firstname;
private String middlename;
private String lastname;

private Set<Addresses> addresses = new HashSet<Addresses>(0);

/*
Setters and getters
*/

}


Address.java
================
public class Addresses
{
private String addressName1;
private String addressName2;
etc...

/*
Getters and setters
*/

}




Here is the way i am accessing the objects in my JSP page
============================================

<spring:bind path="customerGeneral.contacts.firstname"> <form:input path="customerGeneral.contacts.firstname" /> </spring:bind>

<spring:bind path="customerGeneral.contacts.lastname"> <form:input path="customerGeneral.contacts.lastname" /> </spring:bind>

<spring:bind path="customerGeneral.contacts.middlename"> <form:input path="customerGeneral.contacts.middlename" /> </spring:bind>

Till here everything is working.
When i access address object's properties like below

<spring:bind path="customerGeneral.contacts.addresses.addressNa me1"> <form:input path="customerGeneral.contacts.addresses.addressNa me1" /> </spring:bind>


I get error like this:

2008-10-23 09:51:14,909 ERROR [org.springframework.web.servlet.tags.form.InputTag] - MESSAGE : Invalid property 'contacts.addresses.addressName1' of bean
class [com.ifw.admin.domain.contacts]: Bean property 'contacts.addresses.addressName1' is not readable or has an invalid getter method: Does the return
type of the getter match the parameter type of the setter? -
org.springframework.beans.NotReadablePropertyExcep tion: Invalid property 'contacts.addresses.addressName1' of bean class [com.ifw.admin.domain.contacts
]: Bean property 'contacts.addresses.addressName1' is not readable or has an invalid getter method: Does the return type of the getter match the parameter
type of the setter?
at org.springframework.beans.BeanWrapperImpl.getPrope rtyValue(BeanWrapperImpl.java:534)
at org.springframework.beans.BeanWrapperImpl.getPrope rtyValue(BeanWrapperImpl.java:526)
at org.springframework.validation.AbstractPropertyBin dingResult.getActualFieldValue(AbstractPropertyBin dingResult.java:77)
at org.springframework.validation.AbstractBindingResu lt.getFieldValue(AbstractBindingResult.java:337)
at org.springframework.web.servlet.support.BindStatus .<init>(BindStatus.java:117)
at org.springframework.web.servlet.tags.form.Abstract DataBoundFormElementTag.getBindStatus(AbstractData BoundFormElementTag.java:184)
at org.springframework.web.servlet.tags.form.Abstract DataBoundFormElementTag.getPropertyPath(AbstractDa taBoundFormElementTag.java:204)
at org.springframework.web.servlet.tags.form.Abstract DataBoundFormElementTag.getName(AbstractDataBoundF ormElementTag.java:158)
at org.springframework.web.servlet.tags.form.Abstract DataBoundFormElementTag.autogenerateId(AbstractDat aBoundFormElementTag.java:145)
at org.springframework.web.servlet.tags.form.Abstract DataBoundFormElementTag.writeDefaultAttributes(Abs tractDataBoundFormElementTag.java:135)
at org.springframework.web.servlet.tags.form.Abstract HtmlElementTag.writeDefaultAttributes(AbstractHtml ElementTag.java:379)
at org.springframework.web.servlet.tags.form.Abstract HtmlInputElementTag.writeDefaultAttributes(Abstrac tHtmlInputElementTag.java:177)
at org.springframework.web.servlet.tags.form.InputTag .writeTagContent(InputTag.java:139)
at org.springframework.web.servlet.tags.form.Abstract FormTag.doStartTagInternal(AbstractFormTag.java:93 )
at org.springframework.web.servlet.tags.RequestContex tAwareTag.doStartTag(RequestContextAwareTag.java:7 7)
at org.apache.jsp.WEB_002dINF.jsps.crm.customer.custo merAdd_jsp._jspx_meth_form_005finput_005f5(custome rAdd_jsp.java:2636)
at org.apache.jsp.WEB_002dINF.jsps.crm.customer.custo merAdd_jsp._jspService(customerAdd_jsp.java:1150)
at org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.inv oke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.pro cessRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doF orward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.for ward(ApplicationDispatcher.java:292)
at org.springframework.web.servlet.view.InternalResou rceView.renderMergedOutputModel(InternalResourceVi ew.java:142)
at org.springframework.web.servlet.view.AbstractView. render(AbstractView.java:243)
at org.springframework.web.servlet.DispatcherServlet. render(DispatcherServlet.java:1141)
at org.springframework.web.servlet.DispatcherServlet. doDispatch(DispatcherServlet.java:878)
at org.springframework.web.servlet.DispatcherServlet. doService(DispatcherServlet.java:792)
at org.springframework.web.servlet.FrameworkServlet.p rocessRequest(FrameworkServlet.java:460)
at org.springframework.web.servlet.FrameworkServlet.d oGet(FrameworkServlet.java:415)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)





What could be the problem?
Is there any other way to access properties like address which are of collection type <Set>


Please help me!!!

[cmelgar]

You need to specify the index of the object you are accessing within the collection.

e.g. customerGeneral.contacts.addresses[0].addressName1

Normally, you would iterate over the collection using JSTL tags to access each element in the collection.

[joshi.sujit]

I tried with this approach...

Now it gives error like this:

2008-10-23 10:15:36,417 ERROR [org.springframework.web.servlet.tags.form.InputTag] - MESSAGE : Invalid property 'contacts.addresses[0]' of bean class [com
.izmocars.crm.customer.dto.CustomerGeneral]: Cannot get element with index 0 from Set of size 0, accessed using property path 'addresses[0]' -
org.springframework.beans.InvalidPropertyException : Invalid property 'contacts.addresses[0]' of bean class [com.izmocars.crm.customer.dto.CustomerGeneral]
: Cannot get element with index 0 from Set of size 0, accessed using property path 'addresses[0]'

[cmelgar]

Are there actually any items in the Set?

[joshi.sujit]

"Items in the set" means? values in table?

I checked in table there are 115 records...

Set is defined in Contact bean like this:
private Set<Addresses> addresses = new HashSet<Addresses>(0);

[cmelgar]

private Set<Addresses> addresses = new HashSet<Addresses>(0);

This creates an empty Set. Unless you have other code somewhere that populates this with values then it won't contain any items. If you try and access an item index (e.g. 0) that doesn't exist then you will get the error you got before.

If you want to initialise the command object with data then you should look at using the formBackingObject method on the SimpleFormController.

[joshi.sujit]

You mean i need to initialize my object in formBackingObject method?

Here is my current formBackingObject method in my SimpleFormController

protected Object formBackingObject(HttpServletRequest request) throws Exception
{
CustomerGeneral customerGeneral = new CustomerGeneral();

return customerGeneral;
}

What changes i need to made here to make my code work?

Please help me...